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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13f4a87969410987e1dd3e2965cf813c8b8d012cc25b1c09a9b54c8c8d7ab08' 
  AND token = 'xiiyoTrZP3kim8RgT7YMjHs+u0alBnmc5lGKc6kLv4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}